<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>何为数据代理</title>
</head>
<body>
    <!-- 数据代理：通过一个对象代理另一个对象中属性的操作(读/写)-->
     <script>
        let obj = {
            x:10
        }
        let obj2 = {
            y:20
        }


        Object.defineProperty(obj2,'x',{
            set(val){
                obj.x = val
            },
            get(){
                return obj.x
            }
        })
     </script>
    
</body>
</html>